On 29/08/2012 19:06, Kent Overstreet wrote:

On Wed, Aug 29, 2012 at 06:42:43PM +0100, Jonathan Tripathy wrote:

quoted

On 29/08/2012 18:34, Kent Overstreet wrote:

quoted

On Wed, Aug 29, 2012 at 06:22:30PM +0100, Jonathan Tripathy wrote:

quoted

On 29/08/2012 13:12, Jonathan Tripathy wrote:

quoted

On 29.08.2012 08:03, Kent Overstreet wrote:

quoted

I just went ahead and backed out the problematic change. Haven't even
tried building the code yet - but if you feel lucky, it's up. I bet it
fixes it.

Hi Kent,

I pull down your latest code and did a build. I'm pleased to say
that Windows has now installed. I will do some further
testing/benchmarking to make sure that the install is stable.

Many thanks for your quick help

Hi Kent,

A little bad news. With this new build, the spindles are getting
thrashed and this is constantly (never stopping) spewing out on my
netconsole:

[23198.979215] md/raid10:md7: make_request bug: can't convert block
across chunks or bigger than 512k 67230714 4
[23198.979304] md/raid10:md7: make_request bug: can't convert block
across chunks or bigger than 512k 67234814 4
[23198.979393] md/raid10:md7: make_request bug: can't convert block
across chunks or bigger than 512k 67235834 4
[23198.979595] md/raid10:md7: make_request bug: can't convert block
across chunks or bigger than 512k 67276796 3
[23198.979696] md/raid10:md7: make_request bug: can't convert block
across chunks or bigger than 512k 67297276 4
[23198.979791] md/raid10:md7: make_request bug: can't convert block
across chunks or bigger than 512k 67248126 4
[23198.979886] md/raid10:md7: make_request bug: can't convert block
across chunks or bigger than 512k 67284987 3
[23198.979966] md/raid10:md7: make_request bug: can't convert block
across chunks or bigger than 512k 67305471 4
[23198.980215] md/raid10:md7: make_request bug: can't convert block
across chunks or bigger than 512k 67329017 4
[23198.980337] md/raid10:md7: make_request bug: can't convert block
across chunks or bigger than 512k 67323899 4
[23198.980542] md/raid10:md7: make_request bug: can't convert block
across chunks or bigger than 512k 67330047 2
[23198.981707] md/raid10:md7: make_request bug: can't convert block
across chunks or bigger than 512k 67335164 3
[23198.982164] md/raid10:md7: make_request bug: can't convert block
across chunks or bigger than 512k 67346429 4

Any ideas?

Oh hell, I see the problem. That one is not going to be such an easy
fix. I'm going to have to think about it.

Amusing part is it looks like blocksize = 4k was working around the
problem... :/

Ah, ok :)

Please keep me posted when this is fixed, I'm very keen to see
bcache deployed in our cloud infrastructure :)

If there is anything I can do to help from a testing standpoint,
please let me know.

I had an idea for how to work around it :) (and other potential issues
I recently became aware of).

More untested code up!

Wow that was quick! I'll send this to the build server and let you know 
the results.

Cheers

Jonny